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Employee Defined Benefit Obligations - Summary of Net Defined Benefit Asset (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [abstract] |  |
Continuing operations - administrative and marketing expenses | $ 6.6 | $ 1.5
Discontinued operations | 6.2 | 1.0
Net defined benefit liability asset included in profit or loss | $ 12.8 | $ 2.5

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